| mi6.gov.uk | Secret Intelligence Service |
| homeoffice.gov.uk | Home Office |
| surveillancecommissioners.gov.uk | Office of Surveillance Commissioners |
| ncis.co.uk | National Criminal Intelligence Service |
| met.police.uk | Metropolitan Police Service - Special Branch |
| ipt-uk.com | Investigatory Powers Tribunal (IPT) |
| official-documents.co.uk | National Intelligence Machinery |
| gchq.gov.uk | Government Communications Headquarters |
| sfo.gov.uk | Serious Fraud Office |
| scotland.gov.uk | Scottish Executive - Guidelines on Special Branch Work in the United Kingdom |
| five.org.uk | www.five.org.uk/ |
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